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CFTR Intron 8 Poly-T Analysis

Test Code


CPT Code(s)

For New York patient testing, use test code 14700X

Physician Attestation of Informed Consent

This germline genetic test requires physician attestation that patient consent has been received if ordering medical facility is located in AK, AZ, DE, FL, GA, MA, MN, NV, NH, NJ, NM, NY, OR, SD or VT or test is performed in MA.

Preferred Specimen(s)

5 mL whole blood collected in an EDTA (lavender-top) tube

Minimum Volume

3 mL

Alternative Specimen(s)

Whole blood collected in: ACD solution A or B (yellow-top), EDTA (royal blue-top) or sodium heparin (green-top) tube

Collection Instructions

Please indicate the ethnicity of the patient.
Whole blood: Normal phlebotomy procedure. Specimen stability is crucial. Store and ship ambient immediately. Do not freeze.

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 8 days
Refrigerated: 8 days
Frozen: Unacceptable

Reject Criteria

Received frozen


Multiplex Polymerase Chain Reaction • Next Generation Sequencing

This test was developed and its performance characteristics have been determined by Quest Diagnostics. Performance characteristics refer to the analytical performance of the test.

Performing Laboratory

Quest Diagnostics Nichols Institute
33608 Ortega Highway
San Juan Capistrano, CA 92690-6130

Setup Schedule

Set up: Tues, Fri; Report Available: 7-18 days

Reference Range(s)

See Laboratory Report

Clinical Significance

This test is used:
1) To evaluate individuals having phenotypes associated with mild form of cystic  fibrosis, CBAVD, idiopathic pancreatitis, bronchiectasis, etc.
2) To confirm a diagnosis of CBAVD in infertile males.
3) To determine the poly T status in individuals positive for the R117H mutation.

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

LOINC assignment is based on a combination of test attributes, including the method used by the performing laboratory. For tests not performed by Quest Diagnostics, codes are assigned by the performing laboratory.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.